HOW ARE ELECTROMAGNETS USED?

Many modern inventions use electromagnets.

ELECTRIC BELL

When the circuit is closed and the current flows through the circuit, it produces a magnetic field in the electromagnet. The hammer is attracted to the elctromagnet and hits the bell. The movement of the hammer breaks the circuit and the hammer returns to its original position. Then the cycle begins again.

MAGLEV
A magnetic levitation train uses electromagnets to levitate above its track.
The maglev has electromagnets in the base of the train.
The tracks have magnets which repel the electromagnets in the train.
The magnets above and in front of the train attract the magnets in the train, causing the train to move forward.


SPEAKERS AND MICROPHONES
Electric current travels through the coil of wire. This creates a magnetic field that switches on and off rapidly.
The magnetic field attracts the magnet, which is attached to the cone.
The cone vibrates rapidly, producing sound waves.